Relationship With Qos Downstream Rate Application; Guidelines For Configuring The Cell Shaping Mode With Qos Parameters; Configuring A Parameter Definition To Shape Ethernet Traffic Using Cell - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual

Relationship with QoS Downstream Rate Application

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Guidelines for Configuring the Cell Shaping Mode with QoS Parameters

Copyright © 2010, Juniper Networks, Inc.
Chapter 28: Configuring the Shaping Mode for Ethernet with QoS Parameters
NOTE: Do not use the parameter expression on Ethernet interfaces configured
on the ES2 4G LM, GE-2 line module, or the GE-HDE line module.
For example, the subscriber-rate parameter represents the bandwidth of a subscriber.
The shaping rate for the parameter is calculated by referencing an expression that
represents the cell mode adjustment in a scheduler profile:
(config-scheduler-profile)# shaping-rate subscriber-rate - subscriber-rate * cell-mode
% 25
The subscriber-rate - subscriber-rate * cell-mode % 25 expression provides for an explicit
cell-tax factor of 25 percent when the subscriber local loop is transmitting cells. In cases
where the local loop is very-high-bit-rate digital subscriber line (VDSL), the second term
in the expression drops to 0.
ANCP dynamically controls the QoS cell mode application when you create parameter
instances for VLANs using both the QoS downstream rate application and the QoS cell
mode application.
ANCP controls QoS cell mode parameter instances at the VLAN subinterface only; the
protocol does not control parameter instances at the major Ethernet interface or S-VLAN
subinterface.
Configuring a Parameter Definition to Shape Ethernet Traffic Using Cell Mode on
page 268
Example: QoS Parameter Configuration for QoS Cell Mode and Byte Adjustment for
Cell Shaping on page 269
For more information about configuring the QoS shaping mode, see QoS Shaping Mode
for Ethernet Interfaces Overview on page 170
For more information about configuring scheduler rates for QoS parameters, see
Scheduler Profiles and Parameter Expressions for QoS Administrators on page 221
For more information about shaping the downstream rate using QoS parameter
instances that were created dynamically by ANCP, see QoS Downstream Rate
Application Overview on page 283
When you specify the QoS cell mode application, the following considerations apply:
You can have only one parameter definition with the QoS cell mode application
configured.
You must specify a controlled-interface type.
You can specify only instance-interface types of atm, atm-vp, atm-vc, ethernet, svlan,
and vlan.
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